Physics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1067k&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 7, p. 1067-1070
Physics
5
Seismology, Seismology: Core And Mantle, Seismology: Lithosphere And Upper Mantle, Seismology: Surface Waves And Free Oscillations
Scientific paper
Love waves can be converted to Rayleigh waves, which are sometimes called quasi-Love waves, in laterally heterogeneous or azimuthally anisotropic mantle. A local four-station network of broadband seismometers in Hokkaido, Japan, records the quasi-Love waves from the earthquakes located in and around Oregon and California, USA. We infer that these quasi-Love waves are generated by lateral heterogeneity or azimuthal anisotropy beneath the Aleutian or Kuril trench. We attempt to locate the Love-to-Rayleigh conversion areas for the August 17, 1991, off coast of northern California earthquake by using the group velocities of the observed surface waves. The locations of the Love-to-Rayleigh conversion areas concentrate near the Kuril trench. The concentration is the most clear at a low frequency of 8 mHz. This successful location of the conversion areas provides us with an important constraint on the generation of the quasi-Love waves.
Kobayashi Reiji
Nakanishi Ichiro
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